Canon 3624B002 User Manual - Page 60

Double-Feed Detection, Detecting Double Feeds by Document Length, Ultrasonic Double-Feed Detection

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3. Press the Start Key to start scanning. "Verifying..." is displayed. Hint If the specified count is exceeded while scanning, or if the scanned count does not reach the specified count when scanning is finished, an error is displayed. The specified count is exceeded while scanning Scanning finishes without reaching the specified count ■ Double-Feed Detection The scanner can detect double feeds. Two detection methods are used: comparison of document lengths, and ultrasonic detection of spacing between documents, which is set in the ISIS/TWAIN driver. Chapter 4 Other Functions IMPORTANT • The message that appears when a double feed is detected depends on the Rapid Recovery System setting specified in the ISIS/TWAIN driver. See "When the Rapid Recovery System is Enabled" on p. 3-25 for details. • Double feed detection in the Count-Only mode is set in the User Mode, and double feeds are detected ultrasonically. (See "Double-Feed Control Setting" on p. 4-10.) Detecting Double Feeds by Document Length This detection method is effective when scanning documents with pages of the same size. The length of the first page scanned serves as a standard for comparing subsequent pages, and when a page is detected to be approximately 1.4 inches (35 mm) longer or shorter than the standard, a double feed is detected and document transport is stopped. Ultrasonic Double-Feed Detection This detection method is effective when scanning documents with pages of different sizes. The space between overlapping pages is detected ultrasonically, and document transport stops when a double feed is detected. IMPORTANT • Ultrasonic double-feed detection works only when the document pages overlap by at least two inches (50 mm). • If documents stick together due to static electricity, Ultrasonic Double-Feed Detection may not function correctly. • If the presence of adhesive notes or labels on pages is detected as a double feed and you do not want to remove them for scanning, a non-detection zone can be specified in the ISIS/TWAIN driver settings. (See "Double Feed Detection" on p. 8-19.) 4-5

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4-5
Chapter 4
Other Functions
3.
Press the Start Key to start scanning.
“Verifying…” is displayed.
Hint
If the specified count is exceeded while scanning, or if the
scanned count does not reach the specified count when
scanning is finished, an error is displayed.
The specified count is exceeded while scanning
Scanning finishes without reaching the specified count
■
Double-Feed Detection
The scanner can detect double feeds. Two detection
methods are used: comparison of document lengths, and
ultrasonic detection of spacing between documents, which
is set in the ISIS/TWAIN driver.
IMPORTANT
•
The message that appears when a double feed is detected
depends on the Rapid Recovery System setting specified in
the ISIS/TWAIN driver.
See “When the Rapid Recovery
System is Enabled” on p. 3-25
for details.
•
Double feed detection in the Count-Only mode is set in the
User Mode, and double feeds are detected ultrasonically.
(See “Double-Feed Control Setting” on p. 4-10.)
Detecting Double Feeds by Document Length
This detection method is effective when scanning
documents with pages of the same size. The length of the
first page scanned serves as a standard for comparing
subsequent pages, and when a page is detected to be
approximately 1.4 inches (35 mm) longer or shorter than
the standard, a double feed is detected and document
transport is stopped.
Ultrasonic Double-Feed Detection
This detection method is effective when scanning
documents with pages of different sizes. The space
between overlapping pages is detected ultrasonically, and
document transport stops when a double feed is detected.
IMPORTANT
•
Ultrasonic double-feed detection works only when the
document pages overlap by at least two inches (50 mm).
•
If documents stick together due to static electricity, Ultrasonic
Double-Feed Detection may not function correctly.
•
If the presence of adhesive notes or labels on pages is
detected as a double feed and you do not want to remove
them for scanning, a non-detection zone can be specified in
the ISIS/TWAIN driver settings.
(See “Double Feed Detection”
on p. 8-19.)